A novel ESIPT-based fluorescent probe with dual recognition sites for the detection of hydrazine in the environmental water samples and in-vivo bioimaging

Experimental and Theoretical Exploration of ESIPT in a Systematically Constructed Series of Benzimidazole Based Schiff Base Probes: Application as Chemosensors

“…[5][6][7][8] The sensing of analyte by ESIPT active sensor is based on either destroying the donor-H•••acceptor bond by the analyte or regeneration of donor-H•••acceptor bond through breaking of donor-blocking agent bond. The system significantly contributed to ESIPT research is 2-(2-hydroxyphenyl)benzothiazole (HBT), [9][10][11][12][13] in which phenolic À OH acts as proton donor, while nitrogen of thiazole ring serves as proton acceptor. [14] Based on the above discussion, herein we have taken 2-(2hydroxyphenyl)benzimidazole (HBI) in place of 2-(2hydroxyphenyl)benzothiazole (HBT) and then incorporated an aldehyde group at the sixth position of HBI compound to generate HBIA (3-(1H-benzoimidazol-2-yl)-2-hydroxy-5-methylbenzaldehyde) and finally synthesized three Schiff bases, 2-{[3-(1H-benzoimidazol-2-yl)-2-hydroxy-5-methyl-benzylidene]-amino}-benzoic acid (H 2 BIo), 5-{[3-(1H-benzoimidazol-2-yl)-2hydroxy-5-methyl-benzylidene]-amino}-isophthalic acid (H 3 BIdm) and 4-{[3-(1H-benzoimidazol-2-yl)-2-hydroxy-5-methyl-benzylidene]-amino}-benzoic acid (H 2 BIp) by using HBIA and -ortho, -meta and -para substituted amino benzoic acids and studied their ESIPT properties.…”

Highly selective and sensitive fluorescent “TURN-ON” furan-based Schiff base for zinc(ii) ion probing: chemical synthesis, DFT studies, and X-ray crystal structure

“…[31][32][33][34] Recently, numerous fluorescein-based cell permeable Zn 2+ sensor molecules have been disclosed. [35][36][37][38][39][40][41][42] The fluorescence approach is excellent for producing various sensor molecules by designing and synthesizing a reactive moiety that is connected to a certain type of metal ion sensor. [43][44][45][46] The fact that the fluorescence quantum yield is low and favourable ensures that the analyte is mostly responsible for the observed fluorescence intensity if the sensor molecule is converted to the fluorescent form.…”